bbbbbb becure beebee berbee berbeo berber berceo berere berour berrer berube beurre bobber boccob boeber boerre boober booboo booue borbor borore bororo boubou boueer bouree bourou bourre breere breuer brocco brocor brubru bruree bubber bububu bucco- burbur burcer burree burrer c-cube ceecee cerco- ceruce cobber cobbob cocco- cococo coerce coo-er coocoo corour coruco coruro courbe courbu cource courr- crecco crocco crocer cruro- cubber cubero cubube cucube cucurb curber curour currer curror cururo eburru ecobee eebree erbree errour eururo occour occure ocreo- oooooo orcure orrour ouerre rebbec rebeuc rebore rebour recore recour recreo recrue recuer recurb recure rerobe reuere reuour robber robeco rococo roucou rubbee rubber rubro- ruocco urecco urouer uroure